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  • Archive from category "Reinforced earth structures"

Category: Reinforced earth structures

TeMa Geo Solutions: geotechnical solutions

Wednesday, 21 February 2024 by Tema Corporation

The TeMa Geo Solutions division has developed considerable experience in geotechnical applications and developed technologies and products, thereby ensuring that designers can meet increasingly strict regulations concerning the environment and the landscape.

These applications are for the protection, maintenance, retention, reinforcement and drainage in the field of major environmental projects, involving products that provide innovative efficient and long-lasting solutions.

We are aware that a kind of public resistance to sustainability announcements has already begun. We are therefore interested in helping companies that are taking appropriate action to protect the environment. This is not only to ensure that they can better comply with regulations but also, and above all, to increase the effectiveness and credibility of their work.

 

TeMa Geo solutions in applications

The areas of expertise of TeMa Geo Solutions include:

  • football fields
  • landfills and contaminated sites
  • tunnels
  • reinforced soil retaining structures
  • dry slopes
  • grassy road and railway embankments
  • roads
  • drainage ditches
  • horse training and racing tracks.

 

Products and functions: a range starting with geosynthetics

Geogrids are structural elements used to reinforce soils in the construction of retaining walls, block retaining walls, reinforced soil retaining structures, landfills and contaminated sites. The open mesh structure allows the reinforcement geogrids to develop ‘passive’ resistance at the transverse ribs, thus effectively increasing their inherent stabilising effect and enabling the system to withstand significant levels of stress.

The TeMa Geo Solutions range includes uniaxial or biaxial X-Grid geogrids made of fibreglass, polyester or PET coated with a polymer layer, coupled, or not, with a nonwoven geotextile, to be chosen to suit the project.

Offering products such as bentonite geocomposites, drainage geocomposites, facings, erosion control mats and essential accessories, the TeMa Geo Solutions range fulfils various functions for the retention anddrainage of rainwater and groundwater.

The TeMa Geo world offers its long-standing (since 1993) expertise and experience in the polymer-based product category (geosynthetics). Over the years, research at its in-house labs has enabled the development of solutions that integrate with the environment in a more specific sense, such as biodegradable erosion control mats, and in a broader sense, such as geomats and studded membranes.

 

TeMa also offers cutting-edge geotechnical solutions for vineyards

This is not surprising, as the TeMa Geo headquarters are situated on the eastern edge of the Prosecco hills, a UNESCO World Heritage Site. The company therefore has made its experience available to preserve and protect the viticultural landscape with its products for erosion control, reinforcement and ground drainage in an environment subject to the passage of agricultural vehicles. Click here to download the specific catalogue.

 

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System for reinforced soil retaining structures

Thursday, 07 December 2023 by Tema Corporation
reinforced earth

T-System is the system from TeMa Geo Solutions that includes various components for strengthening, surface erosion control, drainage and retaining used in the construction of reinforced soil retaining structures: innovation that we’ve been exploring here at TeMa since our inception 30 years ago, and that is now one of our hallmarks. Let’s take a more detailed look below.

Components for strengthening

Designed for strengthening, the knitted X-Grid PET C geogrids are made from high-strength polyester yarn, with a protective polymer coating. They deliver tensile strength in the 20 kN/m to 800 kN/m range.

Components for erosion control

They protect the face of the structure from erosive agents, like wind and driving rain, until the vegetation has had time to establish. TeMa Geo Solutions offers natural solutions made from cellulose fibres, like Ecovermat, or jute fibres, like Ecovernet, as well as synthetic solutions made from monofilaments (K-Mat F), polypropylene (K-Mat FA) or fibreglass (K-Mat FG Green).

Components for drainage

Drainage geocomposites like Q-Drain are used to address the problem of water seeping into the backfill.

Components for retaining

We have a line of facings made from electrically welded wire mesh — with inclinations ranging from 65° to 80° — to ensure the exposed face is straight.

reinforced earth structure

Practical tips

On site

System components must be stored well away from machinery, and suitably protected from dust or residues from work on site.

To avoid excessive overlaps and waste, the X-Grid geogrids must be cut to size using a suitable metal stand with metal trestles supporting a circular rod to be inserted inside the roll.

Erosion control components — whether biodegradable or synthetic — must be stored in a dry place and not in direct contact with the natural ground, so as to avoid laying problems later on.

Metal formwork must be stored well away from areas where machinery is operating, and carried in only when it is time to install.
During assembly, it is best to apply U-shaped strips of rubber or metal so that the geogrids can be wrapped correctly over the formwork without getting caught on the top of the bars. (see photo)

Special instructions

We advise against backfilling with silty and clayey material; at the very least, only use this kind of material after mixing it with aggregate.

 

The full range of system components comes with instructions on the relevant procedures to be followed. Contact us, we’ll be happy to provide case studies and full information.

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Reinforcement of slopes and embankments

Thursday, 06 July 2023 by Tema Corporation
GEO - Reinforcement of slopes and embankments

Slopes and embankments can be used as road or railway embankments, raised flood banks and floodplains, and even vineyards, especially in a territory such as Italy, one of the countries with the largest number of UNESCO World Heritage landscapes in the world.Many of those greened terraces are true reinforced earth structures, with their stability guaranteed by a well-tested construction technique.

 

Stability for slopes and embankments

Reinforced earth structures are retaining works that allow slopes and embankments to be supported, including steep slopes. They do not involve the use of concrete constructions, which would be more detrimental to the landscape.

The soil has a natural capacity for compressive strength. When combined with geosynthetic grids (which have excellent tensile strength), they create a stable system, as the features of the two components provide a high-performance composite.

The open mesh structure allows reinforcement geogrids to develop passive resistance along the transverse ribs, as well as creep resistance of the geosynthetic grid in relation to the soil. The TeMa Geo Solutions range includes X-Grid geogrids, available in a variety of models depending on the type of project.

 

How to position the geogrid in the layering of a terrain?

Each slope needs to be carefully and expertly engineered. However, in addition to the need to reinforce the raised earth structure with geogrids, it is essential to ensure surface erosion control using synthetic or natural erosion control mats and shaping with electro-welded wire mesh formwork.

The X-Grid geogrid must be applied to each ‘block’ of soil supported by the formwork, positioned between the backfill soil and the erosion control mat. An external wrap-around part, measuring no more than 150 cm, must be provided for the formwork system by installing formwork stiffening ribs approximately 30 cm apart.

 

Stratigrafia pendii e scarpate

 

  1. Foundation soil
  2. Metal formwork
  3. Erosion control mat
  4. Geogrid
  5. Backfill soil
  6. Grassed surface
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  • Published in environmental, GEO, Geogrids, Reinforced earth structures
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Technical considerations in building reinforced soil walls

Tuesday, 02 May 2023 by Tema Corporation
GEO - Valutazioni tecniche nelle opere in terra rinforzata

Reinforced soil walls have proved highly popular in recent years and are produced wherever possible, taking the place of concrete-faced soil retaining wall systems.

Employed in a range of different environments, they bring significant advantages, both financial and environmental. Indeed, unlike concrete-faced soil retaining wall systems, they:

  • are sustainable because they give a vegetated finish;
  • are a great space-saving solution, with slopes as steep as 80° (compared to the 30-40° of natural soil embankments);
  • result in less pollution given the smaller number of trucks required to carry construction materials;
  • make use of the excavated earth for backfilling, provided it is compatible with stability standards, meaning no more material needs to be brought in;
  • blend seamlessly with their surroundings once the slopes are grassed over, without becoming a blot on the landscape of our villages.

Whatever the case, before planning the work, there are a number of aspects and data to be taken into consideration.

 

Preliminary data needed

To start with, all essential technical information must be procured in order to be able to assess the feasibility of the project, such as:

  • geological testing of the area on which the wall is planned to be built
  • topographical surveys
  • meaningful cross-sectional drawings showing the current condition
  • geometry of the planned wall (face angle, height, division into tiers, slope on top)
  • external loads applied to the structure (top loads in the event it needs to accommodate a car park or a road)
  • what earthquake risk zone the area is in
  • geotechnical properties (angle of shearing resistance, cohesion and density) of the earth behind the future wall, of the foundation soil, and of the backfill
  • whether there are perched aquifers or seepage of a different nature.

At this point, the next step is to check design calculations using specific software.

 

Checking design calculations

Checking is performed to assess both internal and external stability. The following tests are carried out in the former case:

  • reinforcement strength test, which assesses possible failure mechanisms and determines the spacing, length and tensile strength of the geosynthetics due to be laid
  • pull-out test to check that the reinforcement applied does not break or slide out
  • direct sliding test, to ensure there is no translational movement across the installation planes
  • wrap-around test, to ensure that the length wrapped around the top of each individual layer is stable.

The checks to be carried out during the project’s execution to assess external stability consist in sliding, overturning, bearing capacity and global failure analysis.

Do you want to chat with one of our experts to find the solution that best suits your requirements?
We have 30 years of experience in the industry and can give you access to materials and solutions offering specific performance. Contact us!

Do you want to learn more about the full TeMa Geo Solutions product range for reinforced earth structures? Click here.

 

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Cycle and pedestrian paths: solutions to make them safer and more attractive.

Friday, 10 March 2023 by Tema Corporation
TeMa Geo Solutions - Cycle and pedestrian paths

Longer days, milder afternoons, a great desire to spend time outdoors and perhaps get some physical exercise, but also go to work and school or visit a friend… These are all good reasons for using, when available, cycle and pedestrian paths, possibly far from urban traffic.

 

The advantages of sustainable mobility

We are increasingly talking about environmental sustainability and the physical and psychological benefits of physical exercise:

  • Less air and noise pollution caused by traffic.
  • Reduced transport costs.
  • Greater freedom of movement.
  • Enhanced green areas in cities.
  • Better quality of life by doing a bit of sport on a daily basis.

 

TeMa Geo Solutions for safety and urban benefits

‘Unequipped’ roads can be hazardous for those who choose to get around by bicycle: for this and environmental reasons, cycle and pedestrian paths are the ideal solution, as they are increasingly becoming part of local government mobility plans.

TeMa Geo Solutions offers all its experience by combining reinforced earth structures and their feature of being green, with cycle and pedestrian paths.

An embankment can be made or a road widened with its sides sloping at 65°/70° using the T-System (consisting of formworks, X-Grid PET geogrids and K-Mat FG Green erosion control mats as facing), thereby making the path safe and allowing a slope to turn green again. Making a slope green again provides a natural erosion control function: to encourage it, TeMa Geo Solutions recommends installing natural or synthetic mats. To make the structure stable, the T-System for reinforced soils adopted by TeMa involves using X-Grid PET geogrids.

 

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  • Published in Erosion mats, GEO, Geogrids, Reinforced earth structures, Reinforced earth structures - Erosion control, Roads
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Reinforced earth structures and drainage

Wednesday, 18 January 2023 by Tema Corporation
GEO - Case study Piemonte

For the extension works at the Serravalle Retail Park shopping centre in the Piedmont region, we helped the company choose the solutions to implement and assisted with verifications.

The area covering about 2,000 sqm required some intervention work regarding reinforced earth structures and drainage. In particular, we undertook the preliminary work for extension works dating back to 2016.

To the south-west of the building, the soil was secured and then surfaces were replanted with greenery.

Let’s see how this was done in more detail.

 

Type of intervention

In order to make the slope in front of the complex secure, the intervention work involved constructing reinforced earth structures in several banks, more specifically 3 modules of 6 m in height each.

In addition, to manage the water coming from the hydro-geographic basin situated upstream of the area, specific surface drainage works were carried out.

GEO - Case study Piemonte

 

The solution from TeMa Geo Solutions

For the reinforced earth structure, 3 modules were constructed with anchorage lengths of 7 m and a strength of 110 kN/m provided by X-Grid PET PC 110 geogrids.

As for drainage, instead, a Membrana Nera Geo was used, the 8 mm HDPE studded membrane bonded to a filter nonwoven geotextile with a PE slotted tube at the base.

The drainage system was also installed at the horizontal contact points of each berm to prevent future water seepage into the reinforced earth structure.

 

GEO - Case study Piemonte GEO - Case study Piemonte

 

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Controlling surface erosion with biomats and geomats

Tuesday, 25 October 2022 by Tema Corporation
GEO - Controlling surface erosion with biomats and geomats

Soil erosion is an almost inevitable natural phenomenon that has become a greater concern in recent years due to the worsening climate situation – in Italy, for example, 132 extreme weather events were recorded between January and July 2022, a higher number than the annual average over the last decade – combined with long periods of drought.

Strong winds, heavy rain, hail and runoff tend to remove the surface layer of exposed soils, which often include organic matter and seeds. Climate change facilitates erosion, making it not only inevitable but also hazardous if left uncontrolled.

It’s essential to counter or mitigate the phenomenon: soil provides us with food, biomass and raw materials; human activities take place on it and it’s part of the landscape and our cultural heritage.

 

Which structures are more subject to surface erosion?

The areas of application most affected by the erosive action of the climate are:

  • slopes and the sides of landfills and contaminated sites, and those that have been grassed for appreciable aesthetic improvement;
  • reinforced earth structures, more specifically terracing in vineyards and the embankments of canals or rivers;
  • ascending/descending ramps from flyovers, tunnel entrances and noise barriers on roads and railways;
  • dry, rocky slopes, of all angles, that shape the terrain of Italy.

 

 

The effects of surface erosion

The uncontrolled removal of the surface topsoil and the failure of vegetation to take root results in ‘thinning’ of the soil and a risk to the stability of sloping areas.

 

What can be done to prevent surface erosion?

We should begin by pointing out that a case-by-case assessment is required that considers many variables, such as the nature and uniformity of the soil, the slope gradient, the type of slope (dry or rocky) and the weather conditions in the area where intervention work is to be carried out.

In general, vegetation, whatever type it is, has a natural ability to protect soils from erosion. So the best course of action is to quickly encourage grassing and then apply biodegradable mats made of jute, straw, coconut and cellulose fibre, which can also be pre-seeded.

TeMa Geo Solutions recommends biomats such as Ecovermat, Ecovermat P and PC, and Ecovernet.

Alternatively, or combined with these, synthetic geomats, mainly made of polymer monofilaments, can be used.

Once laid, they are covered with another layer of soil: in this way, the roots of growing vegetation will become entangled with the geomat, creating an almost permanent erosion protection system.

Once again, TeMa Geo Solutions offers a wide range of geomats to choose from.

 

 

GEO - Controlling surface erosion with biomats and geomats

 

Uncertain about what to choose? We can help you. CONTACT US!

 

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Reinforced earth structures as noise barriers

Thursday, 29 September 2022 by Tema Corporation
TeMa Geo Solutions - Reinforced earth structures as noise barriers

Hearing the noise of traffic outside your window all day long is irritating and distracting and, in the long term, also harmful to your health.

This is why the WHO and a number of laws govern the use of noise remediation systems in cities: the Framework Law no. 447 of 1995 for Italy and the European Directive on Environmental Noise no. 49/2022. If the cause of the noise cannot be addressed, the solution is to install protective barriers. Various kinds can be used, but in this case we focus on reinforced earth structures that require specific measures, which we discuss here.

 

For example, the Pedemontana Veneta is a new toll motorway in Italy: nearly 100 km long. Almost entirely in operation in the north-east of the Veneto region, the main route of this motorway runs through a deep trench in order to minimise the ‘territorial’ and environmental impact on the surrounding area. This means that long sloping areas of reinforced earth can be found along the sides of the motorway, with rows of trees and hedges for 58.61 km and green areas covering 1,333,410 square metres of hedgerows, groves, grassy slopes and tree-lined meadows.
A focus on noise with much regard for the landscape.

 

What do reinforced earth noise barriers consist of?

For this type of embankment with its typical trapezoidal shape, earth is used that will be covered by vegetation over time. Geosynthetic reinforcements and geogrids are added to support the earth, which already has good compressive strength. These are inserted horizontally into the ground and develop friction and tension that stabilise the structure, increasing its resistance to stress.

The TeMa Geo Solutions offer includes the X-Grid Pet PVC range of geogrids, with different resistance values, which are ideal for all kinds of contexts.

Another aspect to bear in mind is surface erosion of the soil: to counteract this, synthetic geomats are applied, also with a mulching function to encourage the growth of grass cover, or natural fibre bionets.

Also in this case, TeMa Geo Solutions offers a wide choice ranging from Ecovermat F Grass and Ecovernet FJ to the K-Mat range.

 

Why use a vegetation barrier as a protective noise barrier?

A vegetation barrier has an unquestionable ability to limit the spread of sound waves: some of them are absorbed, some reflected and some deflected. As a result, the amount of sound waves reaching the receiver is greatly reduced and noise can be dampened by several decibels.

 

The advantages of a reinforced earth sound-deadening barriera

Creating reinforced earth structures brings considerable advantages:

  • it costs less because you can often use earth available on-site
  • no special maintenance is required other than regular trimming.
  • it helps the environment and integrates with it: the use of vegetation also reduces vehicle emissions by absorbing CO 2 and purifying the air.

 

 

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The importance of geogrids in reinforced earth structures

Thursday, 09 December 2021 by Tema Corporation
TeMa Geo Solutions - reinforced earth structures and geogrids

In recent years, reinforced earth structures have been particularly popular in projects due to their excellent functional and aesthetic importance in the residential building and public building industries.

Such intervention works achieve the best results by allowing the soil and geosynthetics to “work in synergy”, each one with its own features of ensuring the stability of the work as a whole.

It’s easy to see the high environmental value of such solutions, but let’s take a closer look at the two major factors in reinforced soil works. In this way, we can understand how and why, working together, they lead to amazing results, also in aesthetic terms.

 

 

What are reinforced earth structures?

They are structural intervention works in various gradients and dimensions aimed at retention and/or stabilisation. We can identify a few main areas of application:

  • Road and railway embankments.
  • Restoration and consolidation of collapsed soil on a road.
  • Construction of ramps for ascending and descending flyovers.
  • Canal or river bank elevations.
  • Rockfall barriers.
  • Noise barriers along roads or railways.
  • Widening of elevated car parks.
  • Construction of terracing systems in vineyards.
  • Soil consolidation at tunnel entrances.

 

Geo - reinforced earth geogrids - river

Geo - reinforced earth geogrids - private house

Geo - reinforced earth geogrids- street

Geo - reinforced earth geogrids - wineyard

 

What are geogrids and why are they often the best solution?

Soil has the intrinsic features of friction and compressive strength, but practically no tensile strength. This is not enough to ensure the stability of a structure.

Major slopes, weather conditions, proximity to embankments, etc. can erode soil, causing landslides and subsidence. For reinforced earth structures, it’s therefore necessary to use geogrids, two-dimensional structures horizontally inserted into soil, which integrate with it without deforming. Their open-mesh structure develops “passive” resistance, thereby increasing the stabilising effect.

This bonding exploits the abilities of the two construction elements, making the entire structure more efficient.

Naturally, the feasibility of retaining works needs to consider:

  • the intrinsic characteristics of the soil, such as grain size, the degree of thickening and shear strength, as well as the dilatancy phenomenon;
  • the characteristics of the geogrids, such as tensile strength and stiffness, the use of raw materials (polymers) that can also withstand harsh chemical and physical conditions (attacks by chemical agents, soil pH, etc.), and the appropriate geometric structure.

 

Greening

Eventually, grass will grow and none of the intervention work will be visible: a really attractive and natural reinforced structure. In addition to its aesthetic function, greening also plays an important role in helping the natural friction of soil.

 

Find out more about our products here.

 

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  • Published in GEO, news, Reinforced earth structures, Reinforced earth structures - Erosion control
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Geosynthetics: Advantages and Applications

Friday, 24 April 2020 by Tema Corporation

Our passion for work does not stop, it simply continues at our company, in a little more limited way. You certainly cannot see us running up and down building sites or going in and out of our research labs, but we can assure you that we are still working on our production of geosynthetic products with the same commitment and perseverance in order to formulate new projects and develop ideas that we will see materialised soon, once everything has ended.

 

TeMa and Geosynthetic Products

TeMa Geo is the TeMa division created almost thirty years ago with the aim of exploring and expanding the world of geosynthetics, which it still does today. By “geosynthetic products” we generally mean all categories of synthetic coverings that are not only used in contact with earth or other building materials but are also appreciated for their use in various building fields. In the building industry, their main advantage is that they are user-friendly in technical terms, which is why engineers and planners prefer them to other technical solutions.

 

The Advantages of Geosynthetics

The advantages of geosynthetic options not only lies in the fact that they are easy to use but also in their cost-effectiveness: certainly less expensive, they provide excellent performance that remains unchanged over time. Furthermore, their versatile use makes them the ideal solution to various on-site problems.

Geosynthetic Products “In the Field”: the Serravalle Project

In more practical terms, today we want to tell you about the intervention works we carried out in the Piedmont region in 2016. It involved extension works for Serravalle Retail Park. In preparation for the works, we had to make the slope in front of the new complex safe. In order to proceed, we had to prepare several reinforced soil structures, separating them into banks, and solve the problems of surface drainage for the management of water, whose catchment area was located above the area.

For works of such magnitude, we used geogrids from the XGrid PET-PVC range as a structural element. In addition, to avoid any seepage in the future, drainage elements were installed close to the reinforced structures of the horizontal sections of each berm. This is just one of our products and one of the many fields of application explored by TeMa.

 

To discover all our membranes, visit our section dedicated to products.

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  • Published in GEO, Geogrids, Reinforced earth structures, Reinforced earth structures - Drainage
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    Via dell’Industria 21
    31029 Vittorio Veneto (TV)
    ITALY
    Tel +39 0438 5031
    Email info@temacorporation.com

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    TeMa Corporation

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    We use cookies to ensure that we give you the best experience on our website. Cookies enable us to provide you functionalities such as security, network management and accessibility. They improve usability and performance through various features such as language recognition, search results and thereby improve what we offer to you. Our website could use also third parties cookies to send advertising that is more relevant to you. Some cookies may be processed by third parties located in countries outside of the European Economic Area (EEA) who may not yet have an adequacy decision from the relevant European data protection authorities. In this case the transfer is based on your consent (Art. 49.1a GDPR).

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